
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'member_page.dart';
import 'category_page.dart';
import 'home_page.dart';
import 'cart_page.dart';


class IndexPage extends StatefulWidget {

  IndexPage({Key key}) : super(key: key);

  @override
  _IndexPageState createState() => _IndexPageState();
}

class _IndexPageState extends State<IndexPage> {
  final List<BottomNavigationBarItem> bottomBars = [
    BottomNavigationBarItem(
      icon: Icon(CupertinoIcons.home),
      title: Text('首页')
    ),
    BottomNavigationBarItem(
      icon: Icon(CupertinoIcons.search),
      title: Text('分类')
    ),
    BottomNavigationBarItem(
      icon: Icon(CupertinoIcons.shopping_cart),
      title: Text('购物车')
    ),
    BottomNavigationBarItem(
      icon: Icon(CupertinoIcons.profile_circled),
      title: Text('个人中心')
    )
  ];

  final List tabBodies = [
    HomePage(),
    CategoryPage(),
    CartPage(),
    MemberPage()
  ];

  int currentIndex = 0;
  var currentPage;

  @override
  void initState() {
    currentPage = tabBodies[currentIndex];
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
       backgroundColor: Color.fromRGBO(244, 245, 245, 1.0),
       bottomNavigationBar: BottomNavigationBar(
         type: BottomNavigationBarType.fixed,
         currentIndex: currentIndex,
         items: bottomBars,
         onTap: (index){
           setState(() {
             currentIndex = index;
             currentPage = tabBodies[currentIndex];
           });
         },
       ),
       body: currentPage,
    );
  }
}